Police discovered a second bomb planted four blocks away, which was safely defused and is currently under investigation, officers said.
The attack occurred when a news agency linked to the jihadists claimed that a “soldier” from the Islamic State group carried out a stabbing attack on a US shopping center that injured eight people last Saturday in the state of the United States. Minnesota.
Local police said the attacker “made some references to Allah”, but the reason is unclear. The assailant was shot dead by an off-duty police officer. There was no suggestion that it was related to the New York bombing.
“A bomb blast in New York is obviously an act of terrorism, but it is not linked to international terrorism,” New York Governor Andrew Cuomo told reporters on Sunday while visiting the crime scene.
“In other words, we don’t find any connection with ISIS, etc.,” Cuomo said, referring to IS, which is based in Iraq and Syria.
WATCH: The moment when a powerful explosion ripped through a busy part of Chelsea in New York
New York Police Chief James O’Neill said no individual or group has yet to claim responsibility.
O’Neill said he couldn’t say with a “100% degree of certainty” where the explosion originated. US media reported that it was planted in a dumpster on 23rd Street where major construction work is underway.
A hotline for suggestions has been established. Police have video of the bombing and were looking for anyone seen in the area prior to the blast.
“We know it’s a very serious accident, but we still have a lot of work to do to tell what kind of motivation is behind it,” Mayor Bill de Blasio told reporters.
“It was a political motivation, a personal motivation. What was it? We don’t know yet,” he added, urging residents to be vigilant.
FBI official William Sweeney said federal investigators would spill over into online traffic, individuals and organizations.
“We will see everything,” he said at the press conference. “We will take a look at the social networks, all the suggestions and leads coming in. Anything that comes is looked at. We don’t discard anything.”
New York will see a strengthened security presence, with nearly 1,000 more state police and national guards deployed at airports, bus terminals and subway stations, officials said.
The blast on 23rd Street between Sixth and Seventh Avenues caused “significant” damage, broken glass and shrapnel across the street, but there was no structural damage to any of the buildings.
Although the two devices planted in Manhattan look similar, they appear to be different from a tube bomb that exploded in neighboring New Jersey on Saturday without causing any injuries, officials said.
Of the 29 people who were injured in New York, 24 were taken to hospital with scratches and abrasions of varying degrees from glass and metal. They have all since been released, officially confirmed on Sunday.
New York praises itself as the safest large city in America. Violent crime is rare in Manhattan, and police say they have foiled 20 terrorist plots since the 2001 al-Qaeda hijackings destroyed the Twin Towers.
New York Congressman Peter King said that officials had not yet determined a known terror link was not necessarily conclusive.
“In many of these cases we don’t know until two, three or four days later whether or not there is a terrorist link,” he told CBS. “The fact that there is no evidence at the moment doesn’t mean much,” she added.
Police sealed off northern Chelsea around the crime scene and dozens of officers were in force on Sunday. An AFP photographer said there was a lot of debris, including rubble and glass on 23rd Street.
“There are special events happening throughout the city today. Actually in all five boroughs. We have increased our police presence at each of these events,” said Senior New York Police Officer Carlos Gomez.
“We have also added more counter-terrorism agents and heavy weapons teams in some of these events. Strategic Response Group and Critical Response Command teams,” he said.
Turnbull urges New Yorkers to “not be intimidated”
Prime Minister Malcolm Turnbull and his wife Lucy spoke to commuters on the city’s famous subway, encouraging them to “not be intimidated” as police continue to hunt down those responsible for activating a bomb in the upscale suburb of Chelsea. in Manhattan.
“New Yorkers are getting on with their normal life, it’s as usual,” Turnbull told reporters gathered near Grand Army Plaza in the borough of Brooklyn.
“The only thing we can’t do is let the people we try to harm us, whatever their motives, intimidate us.
“We challenge them by facing our lives in a normal way.”
Australian Prime Minister Malcolm Turnbull speaks to media in New York (AAP) sources: AAP